I think the change on her clothes from AOU to CW is more to show that she went from “young in a precarious situation” to living in a good place, taken care of, etc.

Oh and in Infinity War she was on the run, so more discreet clothes and stuff

Yes, it’s partially meant to indicate that, but I addressed it being solely communicating that in the other answer:

This is less to do with her living in impoverished Sokovia than one
might think–Pietro has a much more kempt style to him, and his clothing
doesn’t suggest as much about his age as hers does.

This matches with what we see of her in the hotel room, and that .1
second shot of her in costume in Wakanda. The “less make-up” thing is
really pointed especially.

They could have chosen many styles to communicate “Wanda is impoverished” and “Wanda is on the run”, but they chose styles that would also strongly communicate age, too. After all, these are her “discreet clothes” in Civil War:

They could have continued dressing her in the exact same style, but they didn’t, they aged her up. She continues to wear less (Hollywood) make-up in Wakanda. These being the only outfits she’ll likely get to wear, they have to communicate a lot, and they chose to give her clothing and style her so that she would, again, seem to jump up in age. It’s also worth noting Marvel’s costuming department makes almost all of their clothing from scratch, and they think of a lot when they dress them.

Anyway, I’ve gone on about this for a while now, so if you want to keep talking, please PM me. 🙂